JP3091257B2 - Camera film rewind control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film rewinding control device for a camera, and more particularly to a camera having an electric film rewinding device provided with a timer circuit for detecting a film rewinding state and automatically stopping rewinding. About.

[0002]

2. Description of the Related Art Conventionally, in a camera having an electric film rewinding device, a timer is operated by stopping the movement of a film and the rewinding is stopped after a predetermined time has elapsed. If rewinding is performed in a state where the spool is not tightly wound (hereinafter referred to as "buka winding"), the timer elapses while the buka winding of the film is being wound in the patrone, and the film In some cases, the rewinding device may stop before the rewinding is completed.
As a solution to this, there is a method of making the timer time sufficiently long. However, when the rewinding is completed, the motor idles for a long time.

On the other hand, Japanese Patent Application Laid-Open No. 1-279228 discloses a method in which the timer is set to a sufficiently long time only during halfway rewind, paying attention to the fact that the above-mentioned winding state occurs only during halfway rewinding. Have been.

[0004] Japanese Patent Publication No. 21571/1990 discloses that
When there is fogging, control of motor stop is performed according to the set timer time. When there is no fogging or when fogging is eliminated, this is judged by the movement of the film, and the timer time is switched to a shorter time. Is disclosed.

[0005]

However, in the former method disclosed in Japanese Patent Laid-Open No. 1-279228,
During automatic rewinding, there is no long-time idle rotation upon completion of rewinding, but long-time idle rotation during intermediate rewinding cannot be prevented.

Here, considering the use of a camera, when performing rewinding halfway, it is not preferable to perform the long-time idling in consideration of the fact that it is often desired to change the film as soon as possible.

[0007] On the other hand, the latter method disclosed in Japanese Patent Publication No. Hei 2-21571 switches the timer time based on the detection of the movement of the film, so that the following problem occurs. In other words, the phenomenon that the film is winding is an unstable state of the film, the film moves immediately after the start of rewinding, and the signal that the film movement signal is output a little and the signal is not output after that May be. This phenomenon is particularly likely to occur at low temperatures when the rigidity of the film increases.

If the film stays near the threshold of the film movement detecting device, that is, for example, if the film moving detecting device is constituted by a photoreflector, the detection light is emitted at or near the edge of the perforation of the film. If the film is stopped at such a position, there is a case where a film movement signal is output due to noise at the time of idling of the motor.

After all, even in the latter method, a little pulse is initially output at the time of rewinding under the unstable condition of the output of the film movement detection device at the time of the above-mentioned winding tightening, and then the winding is continuously performed. If it has been performed, since the timer has already been changed to a shorter timer by the pulse at the beginning of rewinding, there still remains a problem that there is a disadvantage that the automatic stop is performed while the burr is being tightened. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is possible to reliably perform rewinding regardless of the presence or absence of fluttering and to reduce the idling time of the motor upon completion of rewinding as much as possible. It aims to reduce the rewind time.

[0011]

According to a first aspect of the present invention, there is provided a camera film rewind control device for rewinding a film in response to a rewind start command. Rewinding means, signal generating means for generating a film movement signal in accordance with the movement of the film, and during rewinding of the film by the electric rewinding means, starts counting a predetermined reference time, and within the predetermined reference time, Timer means for resetting the count when the film movement signal is generated from the signal generation means, and counting up when the film movement signal is not generated from the signal generation means within the predetermined reference time; Rewind control means for terminating the rewind operation by the electric rewind means in response to the count-up of the timer means, wherein the rewind operation by the electric rewind means is provided. After stopping, characterized in that to allow restart the rewinding operation until a predetermined number of times.

According to a second aspect of the present invention, there is provided a film rewinding control device for a camera, comprising: an electric rewinding unit for rewinding a film in response to a rewinding start command; A signal generation unit that generates a signal, and starts counting a predetermined reference time during rewinding of the film by the electric rewinding unit, and the signal generation unit generates the film movement signal within the predetermined reference time. Resets the count, timer means for counting up if the film movement signal is not generated from the signal generating means within the predetermined reference time, and the electric rewinding means in response to the count up of the timer means. Rewind control means for terminating the rewind operation by the means. Characterized in that to enable repeated movement.

[0013]

According to the film rewind control device for a camera according to the first aspect of the present invention, when the rewind of the film is started in response to the rewind start command, the film is transferred.
A film movement signal is generated from the signal generation means. When this film movement signal is generated before the timer means counts up, that is, when the film is not in the flickering state, the film movement signal is continuously generated with the transfer of the film. The timer means does not count up. When the rewinding of the film is completed and the film is no longer transported, the film movement signal is not output, and the timer means counts up. The rewinding control means terminates the rewinding operation by the electric rewinding means in response to the count-up of the timer means. On the other hand, when the film is in a fogging state, even if the rewinding of the film is started in response to the rewinding start command, the film is not immediately transferred. , The timer means counts up. In response, the rewind control means terminates the rewind operation by the electric rewind means. Here, in the camera film rewind control device according to the first aspect of the present invention,
After stopping the rewinding operation by the electric rewinding means, the rewinding operation can be restarted until a predetermined number of times is reached, and the rewinding operation is repeated until the predetermined number of times is reached, Since the fogging state is eliminated, the film is reliably rewound. When the film is not loaded, or when the film is already in the rewind state, and a rewind start command is given, the rewind operation is stopped when the predetermined number of times is reached. Can be prevented from idling.

According to the film rewind control device for a camera according to the second aspect of the present invention, when the rewinding of the film is started in response to the rewinding start command, the film is transported, and the film is transferred from the signal generating means. A signal is generated.
When this film movement signal is generated before the timer means counts up, that is, when the film is not in the flickering state, the film movement signal is continuously generated with the transfer of the film. The timer means does not count up. And when the rewinding of the film is completed and the film is no longer transported,
This film movement signal is not output, and the timer means counts up. The rewinding control means terminates the rewinding operation by the electric rewinding means in response to the count-up of the timer means. On the other hand, when the film is in a fogging state, even if the rewinding of the film is started in response to the rewinding start command, the film is not immediately transferred. , The timer means counts up. In response, the rewind control means terminates the rewind operation by the electric rewind means. Here, in the film rewind control device for a camera according to the second aspect of the present invention, for a predetermined time after the start of the rewind operation by the electric rewind means, the restart of the rewind operation can be repeatedly performed, Until the predetermined time is reached, the restart of the rewinding operation is repeated, whereby the fluttering state is eliminated, so that the film is reliably rewound. When the film is not loaded, or when the film is already in the rewinding state, and a rewinding start command is given, when a predetermined time after the rewinding operation is started by the electric rewinding unit is reached. Since the restart of the rewind operation is no longer performed, idling of the motor can be prevented.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a first embodiment of the present invention.
Controls the motor bridge circuit 12 composed of the transistors T1 to T4 to perform normal rotation, reverse rotation and braking of the motor M, and controls winding, rewinding and stopping of the film 1.

Here, transistors T2 and T3 are connected to CP
The motor M is turned on in response to the film winding signal from U11 to rotate the motor M forward, and the film 1 is wound through a known gear coupling mechanism. Also, the transistor T
1, T4 is turned on in response to a film rewind signal from the CPU 11 to rotate the motor M in the reverse direction, thereby causing the film 1 to rewind. That is, the electric hoisting means is constituted by the transistors T2, T3, and the motor M (indicated by the path of the arrow A in the figure), and is constituted by the transistors T1, T4, and the motor M (indicated by the path of the arrow B in the figure). It constitutes electric rewinding means.

The CPU 11 reads the DX code of the film cartridge from the DX terminal, and determines the number of photographable frames of the currently loaded film.

The switch SW1 is a switch that is turned on when rewinding is performed halfway, that is, before the number of photographable frames is reached. When the switch SW1 is turned on, or when the on / off waveform from the photoreflector 13 generated by the movement of the film perforation 1A during the winding of one frame is not input, the CPU 11 recognizes that the film is over and rewinds. Start operation.

The photoreflector 13 functions as the signal generating means, and includes a near-infrared light emitting diode (hereinafter, referred to as IRED) and a phototransistor (hereinafter, referred to as PTr). A pulse waveform is output based on the difference in reflectance between the portion and the film surface without holes.

Further, the CPU 11 performs the rewinding operation a plurality of times (for example, up to five times) in a short cycle (for example, two seconds) until the flapping is eliminated. .

Hereinafter, the operation of the above configuration will be described in more detail with reference to the flowchart of FIG.

First, the port P5 of the CPU 11 is set to "L", and the IRED of the photoreflector 13 is turned on (step S1). Next, the port P1 of the CPU 11 =
By setting "H", port P2 = "H", port P3 = "L", and port P4 = "L", the motor M is normally rotated for winding the film 1 (step S2).

At this time, the number of perforations by the photo reflector 13 at the time of film winding is counted, and the accumulated value β is stored in a register (not shown) in the CPU 11 (step S3).

After resetting a timer 1 flag (not shown) configured in the CPU 11 (step S
4) Then, the timer 1 (not shown) in the CPU 11 is turned on to start the clocking operation (step S5). Here, the timer 1 is set to 4 seconds. When the predetermined timer count by the timer 1 ends, the timer 1 flag is set.

Here, the CPU 11 detects the input of the port P6, counts the film perforations 1A, and detects whether or not the film has moved by 8 perforations (step S6). If this occurs, the process proceeds to step S14 described below.

However, if the film has not moved by 8 perforations, then the CPU 11
It is detected whether the timer 1 flag is set (step S7). If the timer 1 flag is set, it is determined that further winding of the film 1 is impossible, and the process proceeds to step S8 of film rewinding, and if not, the process returns to step S5.

In step S8 for rewinding the film, the number of retries N is reset. The number of retries is the number of times the rewind routine is executed in the next step S9.

Next, in step S9, a motor rewind routine is executed. This motor rewind routine
This is performed as shown in FIG. 3, and details will be described later.

Upon returning from the motor rewind routine, the number of retries N is incremented by "1" (step S10), and the value of the number of retries N is incremented by a predetermined amount α (for example, "5") is determined (step S11). Here, the predetermined amount α is a predicted maximum value of the number of executions of the rewinding routine required to eliminate the flickering of the film 1. That is, no matter how much the film 1 is in a fogged state in the patrone, the rewinding operation (the film 1
Is not transferred, the rewinding operation for 2 seconds is changed to α
This is the number of times that it is safe to assume that the winding has been released if the rotation is performed.

If it is determined in step S11 that the value is equal to or more than the predetermined amount α, the flow advances to step S1 to be described later.
The rewinding is completed in a series of sequences from the fourth onward. However, if the predetermined amount α has not yet been reached, the next step S
The process proceeds to step 12 and thereafter, and the motor rewind routine is executed again.

That is, in step S12, it is determined whether or not the number of perforations counted from the start of rewinding is equal to or larger than the stored value β. Here, the stored value β is the number of perforations corresponding to the film winding amount as described above. That is, since the film is not rewound more than the winding amount, when the number of pulses counted at the time of rewinding in step S12 becomes equal to or more than the stored value β, a predetermined amount α is substituted into the number of retry N ( Step S
13) Forcibly shift from step S11 to step S14. If it is less than the stored value β, the process returns to step S9. This prevents the useless retry from being repeated when the film 1 is wound up only a little.

In step S14, port P1 of CPU 11 = "H", port P2 = "H", port P3
= "H", port P4 = "H", and the motor brake is applied. Subsequently, the port P1 of the CPU 11 = "L",
Port P2 = “H”, Port P3 = “H”, Port P4
= "L" to turn off the motor M (step S1
5). Then, the port P5 of the CPU 11 is set to "H", and the IRED of the photoreflector 13 is turned off (step S16).

When an intermediate rewind is instructed by turning on the switch SW1, the port P of the CPU 11 is
After setting 5 = “L” and turning on the IRED of the photoreflector 13 (step S17), the above-described operation is performed from step S8.

The motor rewind routine in step S9 is performed as shown in FIG. That is, first, the CPU 1 generated by the movement of the perforation
A pulse count based on "H" and "L" of the input of the port P6 of 1 is started (step S91). Here, CPU1
The port M1 is set to “L”, the port P2 is set to “L”, the port P3 is set to “H”, and the port P4 is set to “H”, and the motor M is rotated in reverse for rewinding the film 1 (step S92).

Next, the port P5 of the CPU 11 is set to "L", and the IRED of the photo reflector 13 is turned on (step S93). Then, after resetting a timer 2 flag (not shown) configured in the CPU 11 (step S94), the timer 2 (not shown) in the CPU 11 is turned on to start a clocking operation (step S95). Here, the timer 2 is set to 2 seconds. When the predetermined timer count by the timer 2 ends, the timer 2 flag is set.

Here, the CPU 11 determines whether or not the perforation counter has counted one or more pulses, that is, whether or not there is a movement of one or more perforations by detecting "H" and "L" by the PTr output to the port P6. Is detected (step S96). If this has been counted, the flow returns to step S94, and if not, the flow proceeds to the next step S95.

In step S95, it is detected whether or not the timer 2 flag is set, that is, whether or not two seconds have elapsed since the signal from the PTr is no longer output.
If the timer 2 flag has not been set, the process returns to step S96.

However, if the timer 2 flag is set, that is, if two or more pulses have not been output and two seconds have elapsed, it is determined that rewinding has ended and the CPU
Assuming that port P1 = “L”, port P2 = “H”, port P3 = “H”, and port P4 = “L” of the motor 11
Is turned off (step S98), and the process returns.

As is apparent from the above description, in this embodiment, when the film 1 is not transferred even when the motor M is rotated for rewinding when the film is in the winding state, the timer 2 is provided. The rewinding operation is restarted until the count-up of the fixed amount α is performed.

If the transfer of the film 1 is started before the timer 2 counts the predetermined amount α times, the film 1
The timer 2 continues to be reset by the film movement pulse signal generated by the movement of the film. Then, the number of film movement pulse signals generated during the rewinding is counted, and the count value is compared with the number of film movement pulse signals (memory value β) accumulated when the film 1 is wound up. Is determined, and the number of times of counting up of the timer 2 is forcibly set to the α times, whereby the rewinding operation is completed by the timer 2 for 2 seconds.

Next, a second embodiment of the present invention will be described.
FIG. 4 is a flowchart for explaining the operation of the second embodiment of the present invention. That is, in the second embodiment, the timer 3 is provided, and the restart of the rewind operation is repeated for a predetermined time after the start of the rewind operation (time until the timer 3 counts up). (Steps S20 to S22). That is, in the above-described first embodiment, the maximum number of restarts of the rewinding operation is determined by the set number α, whereas in the second embodiment, the maximum number of restarts is limited by the time set in the timer 3. It is something to do. Other operations are the same as those of the first embodiment, and the description thereof is omitted.

As described above, rewinding is performed while the timer for detecting the end of rewinding counts up.
For a predetermined time after the start of the rewinding operation, restarting of the rewinding operation is repeated. After rewinding a predetermined amount (predetermined time) from the start of the rewinding operation, if the count-up is performed even once, the restarting of the rewinding operation is restarted. Is not performed, that is, rewinding is completed. Therefore, irrespective of the presence or absence of back winding, rewinding can be reliably performed, and the motor idling time upon completion of rewinding can be reduced as much as possible, thereby shortening the rewinding time.

[0044]

According to the present invention, regardless of the presence or absence of the winding, the rewinding is reliably performed, and the idling time of the motor when the rewinding is completed is reduced as much as possible to shorten the rewinding time. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating an operation of the first exemplary embodiment of the present invention.

FIG. 3 is a flowchart illustrating a motor rewind subroutine in FIG. 2;

FIG. 4 is a flowchart for explaining the operation of the second embodiment of the present invention.

[Explanation of symbols]

 11 CPU 12 Motor Bridge Circuit 13 Photo Reflector M Motor

Claims (2)

(57) [Claims] An electric rewinding means for rewinding the film in response to a rewind start command; a signal generating means for generating a film movement signal in accordance with the movement of the film; and a rewinding of the film by the electric rewinding means. In the meantime, counting of a predetermined reference time is started, and when the film movement signal is generated from the signal generation means within the predetermined reference time, the count is reset, and the signal generation means is reset within the predetermined reference time. And a rewind control means for terminating the rewind operation by the electric rewind means in response to the count-up by the timer means. A film for a camera, wherein after the rewinding operation by the electric rewinding means is stopped, the rewinding operation can be restarted until a predetermined number of times is reached. Back control device. 2. An electric rewinding means for rewinding a film in response to a rewinding start command; a signal generating means for generating a film movement signal in accordance with the movement of the film; In the meantime, counting of a predetermined reference time is started, and when the film movement signal is generated from the signal generation means within the predetermined reference time, the count is reset, and the signal generation means is reset within the predetermined reference time. And a rewind control means for terminating the rewind operation by the electric rewind means in response to the count-up by the timer means. A predetermined time after the start of the rewinding operation by the electric rewinding means, the restart of the rewinding operation can be repeated; The control device.